基于GIS空间数据的滑坡SPH粒子模型研究

SPH landslide model based on GIS spatial data

针对光滑粒子流体动力学方法(SPH)在滑坡模拟中建立粒子模型的难题,提出了基于地理信息系统(GIS)栅格数据的粒子排列与插入方法。根据该方法,建立了滑坡SPH粒子模型及相关粒子生成程序,进一步以结合摩尔-库仑破坏准则的SPH宾汉流体模型为核心,实现了运用SPH方法模拟滑坡破坏后三维运动的过程。该SPH模型在对唐家山滑坡的模拟中得到了验证,并预测了金坪子滑坡破坏后的影响范围。结果表明:基于GIS空间数据的滑坡SPH粒子模型具有可行性与良好的适用性。以GIS数据库为基础,开展滑坡灾害的模拟研究,将大大提高对滑坡等地质灾害的仿真分析,为滑坡灾害的预测与防治提供参考。

The existing smoothed particle hydrodynamics（SPH） method is normally difficult to establish the particle model in the simulation of landslide. This paper aims at developing a new particle arrangement and insertion method based on geographic information system（GIS）. Firstly, the SPH particle model is established and its corresponding particle generation is programmed. Secondly, the Bingham fluid model combined with the Mohr-Coulomb failure criterion is used to achieve the three-dimensional movement process of the damaged slope. Finally, the SPH model is verified by simulating Tangjiashan landslide and is further applied to predict the influence of the Jinpingzi landslide. The results indicate that the established landslide SPH model based on spatial GIS data is feasible and applicable. Therefore, the simulation study of landslide disasters can not only enhance greatly the analysis of geological disasters, but also provide reference for the forecast and control of landslide hazard.